• Molecules and Cells
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• 제22권2호
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• pp.233-238
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• 2006

Endogenous salicylic acid (SA) and its predominant conjugates, SA 2-O-${\beta}$-D-glucoside (SAG) and the glucose ester of SA (SGE), increase dramatically during plant defense responses. Here I report the isolation and characterization of an Arabidopsis thaliana UDP-glucose:SA glucosyltransferase1 (AtSGT1) gene using a tobacco SGT gene previously reported, whose product catalyzes the formation of both SAG and SGE. The recombinant AtSGT1 protein had significant activities with SA and benzoic acid, and synthesized SAG and SGE. Northern blot analysis showed that AtSGT1 was rapidly induced both by exogenous SA and infection with the bacterial pathogen Pseudomonas syringae, indicating that pathogen-inducible AtSGT1 expression is an early disease response and may be involved in the accumulation of glucosyl SA during pathogenesis.

• Natural Product Sciences
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• 제17권3호
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• pp.175-180
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• 2011

Eleven compounds were isolated from fresh leaves of Abies koreana (Pinaceae), and structures of these compounds were determined to be 3-hydroxy-2-methyl-4-pyrone (1), maltol-3-O-${\beta}$-D-glucoside (2), (-)-epicatechin (3), naringenin 7-O-${\beta}$-D-glucopyranoside (4), naringenin-7-O-rhamnoglucoside (5), kaempferol 3-O-${\beta}$-D-glucopyranoside (6), (+)-isolariciresinol (7), secoisolariciresinol (8), rhododendrol (9), ferulic acid (10) and 4-(4-hydroxyphenyl)butan-2-one (rheosmin) (11) by comparing $^1H$-, $^{13}C$-NMR and MS spectroscopic data with reference values. Compounds 3, 5, 7, 8, 9, 10, 11 were isolated for the first time from A. koreana. Among eleven isolates, compounds 1, 7 and 11 showed inhibitory activities against lipopolysaccharide (LPS)-induced nitric oxide (NO) production in BV-2 microglia in a concentration dependent manner.